A few examples of the static methods of PHP program _php Tutorial

The rules for static methods are the same as static variables. You can use the Ststic keyword to identify a method as a static method, using the name and scope of the class to qualify the operator:: You can access a static method.

One important difference between static and non-static methods is that when you call a static method, we don't need to create an instance of the class.

Program List: Using class-Named parameters

The non-inherited static problem can be solved by using the class famous as parameter.

Program Run Result:

I ' m Apple

Program List: Overriding base class methods

Overrides a method of a base class in a derived class.

Program Run Result:

Apple ' s color is red

Program List: Use of static arrays

Both static and const scopes can be accessed using:: Operators, and if you want to access an array using:: operator, you need to declare the array as static in advance.

  
 
  ' Red ', ' color2 ' = ' yellow ');} Class apple{public  function __construct ()  {    var_dump (Fruit:: $color);}  } Class banana{public  function __construct ()  {    Fruit:: $color = FALSE;  }} New Apple ();    Prints Array (2) {["Color1"]=> string (3) "Red" ["Color2"]=> string (6) "Yellow"} echo '
'; new Banana (); new Apple ();    prints bool (false)?>

Program Run Result:

Array (2) {["Color1"]=> string (3) "Red" ["Color2"]=> string (6) "Yellow"} bool (FALSE)

Program list: One more singleton mode

Static is really cool, the following program shows how to get an already existing instance.

    
 
  Value = $value;    }    public static function getinstance () {        if (self:: $instance = = null) {            echo]
New
";            Self:: $instance = new Singleton ("values");        }  else {            echo '
Old
";        }        Return self:: $instance;    }} $x = Singleton::getinstance (); Var_dump ($x); Returns the new object$y = Singleton::getinstance (); Var_dump ($y); Returns the existing object?>

Program Run Result:

NewObject (Singleton) #1 (1) {["Value:private"]=> string (6) "Values"} oldobject (Singleton) #1 (1) {["Value:private"]= > string (6) "Values"}

http://www.bkjia.com/PHPjc/752389.html www.bkjia.com true http://www.bkjia.com/PHPjc/752389.html techarticle the rules for static methods are the same as static variables. You can use the Ststic keyword to identify a method as a static method, using the name and scope of the class to qualify the operator:: You can access static methods ...

